In a food processor, add the cranberries, lime zest, agave and water. Pulse until well combined, adding additional water 1 tbsp at a time if necessary.
If there are still chunks of cranberries, pour through a fine mesh sieve into a bowl.
Fill each rocks glass with ice and add 4 tbsp of the cranberry syrup.
Top with vodka and ginger beer.
Garnish with cranberries.
Recipe by Lauren Anne at https://bylaurenanne.com/cranberry-ginger-vodka-cocktail/